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How to make periscope with cardboard | Science project 9x12 inch cardboard sheet 1 18x3 inch cardboard sheet 2 A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position. In its simplest form, it consists of an outer case with mirrors at each end set parallel to each other at a 45° angle. FOR MORE Periscope vedio click below link 1.How to make simple periscope from cardboard and pvc pipe https://youtu.be/N7ePXY0kjsI 2.How to make periscope with cardboard | Science project https://youtu.be/BP817TZghfY 3.How to make periscope with cardboard and plastic bottle | sciences project https://youtu.be/6IonoxzugKo 4.How to make periscope with cardboard | Science project https://youtu.be/Ysk4SM1jEp4 5.How to make simple periscope from pvc pipe and mirrors https://youtu.be/dOp1EoKh1kA 6.How to make periscope with cardboard | School project https://youtu.be/Bnjn5e4LTmE